Chilly Dog Union Jack Sweater. Don't let your dog walk around nude when it's chilly outside! Keep your dog cozy and warm with a thick wool dog sweater. Chilly Dog Cable Knit dog sweaters are made following Fair Trade guidelines. All sweaters are handmade & may vary slightly in color & style. 100% wool made in the Northern Highlands of South America by descendants of the Inca Indians. The Incas have handed down the craft of knitting through many generations. For 11 years, Chilly Dog has directly employed two families to knit our sweaters and practices within the guidelines of Fair Trade.